Hey just thought of another possibilty has any work been done recently? make sure lines are not crossed. once I had done a frame off on an 84' sturgis shovelhead and when I took it to my guru to get the last dial in done (i still havent mastered timing adjustments on the twin cam and i don't like getting a face full of oil anyway) I had forgotten to hook up an oil line to the rocker boxes and got to hear about it for weeks about how lucky I was that "bean" noticed it before it burned up the motor but hey what was I payin him for anyway but check everything and don't ferget. what did you do to it just before it started gettin funky. is the filter in upside down? you know simple things first. eliminate the impossible and everything else no matter how improbable is one of your possibilities! have fun and let me know

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On the softail model Harley Davidson's the oil tank is external and sits up higher than the engine crank case and oil pump. when these bikes sit for an amount of time the oil gravitates from the tank to the crank case. starting may seem sightly harder and seem like the battery is going dead. the bike should be started in knowing that you had oil in it to start with and no giant leak puddle underneath of it. warm up the engine and then drain the oil out of the tank. the reason why your filler cap popped off is because you had probably 2 1/2 to 3 quarts to much engine oil in the bike. so drain the oil from the tank at the drain pug at the bottom of the hose on the high (right side ) of the bike where the swing arm meets the frame (it is a 5/8 socket) put the drain plug back in run the bike for about 5 minutes inspecting with a flashlight continuously that oil is circulating back into the tank. then dran it again and replace with new oil.

Very common on h-d big twins for the last 75 years or so. These bikes have a dry sump oil system which means you have 2 oil pumps, feed and scavenge. The feed pump is very puny compaired to the scavenge, so at idle (especially when hot) it carries only a couple of pounds of pressure and that is all you need. The scavenge pump has a much greater capacity because if it can't keep up the crancase will start filling up and the crank will start slogging through the oil, killing performance. These bikes are equipped with hydraulic valve lifters which will start clanking loudly if you have a real oil pressure problem. Enjoy your ride and don't sweat it.

Harley's do run hot, anywhere from 220 to 240 normally, and a little hotter this time of year. I suggest running a straight weight oil, and a little heavier weight in the summer. I use Valvoline VR-1 30 weight most of the year, and 50 or 60 weight in the hot summer, and I use Lucas 20w50 primary/trans for the primary and tranny. I don't bother with the extremely high prices of the HD oils. For the whining noise, you need to determine which side of the engine it's coming from. Whining will almost always be in the bottom end. There's nothing in the top end that should whine, and if there is whining from the top, it's usually an air leak around the carb. Start by checking the fluid levels in the tranny, and primary. These are the two most common areas to pick up a whining noise. If it's coming from the left, it's going to be in the primary, and usually this is caused by low fluid levels. From the right, it's going to be either the tranny, low fluid, or the oil pump. The oil pump is a gear type system. If you're running a light weight oil, say a 10w40 or HD 20w50, when the engine heats up and the oil thins, it can cause the oil pump gears to whine a bit, especially in the summer heat. So, check the fluid levels, if they check good, then change the oil, since the summer is coming to an end, go with a straight 30 weight. This should clear up the whining noise. If it doesn't, get back to me with the exact location the noise is coming from, and we'll go to the next level of diagnosing the whine, but I believe that this will cure it.

miles don't mean a thing in this instance. miles only tell us a small bit about the wear on the machine cuz' as you know not all miles are the same. I know that my miles are like dog years when it comes to puts. I ride hard and fast and wear out pegs as fast as tires man! but thats another story. where is the pressure guage? think about that, but also think about this, your partners machine is sending mixed signals. the oil light means LOW pressure cuz it usually goes out when the mill starts spinnin at idle right? but then the guage is readin high. what kinda guage?where is it tapped in? if its on the gear case and thats high and the light sensor is in the pump then somethin in between aint right? need more info and i will look at the plumbing on the evo I'm a little rusty there